Portable power bank



FIG. 1 is a front view of a Portable Power Bank showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof, the bottom view being a mirror imagethereof;

FIG. 4 is a right side view thereof, the left side view being a mirrorimage thereof;

FIG. 5 is a top, rear, right side perspective view thereof; and,

FIG. 6 is a bottom, front, right side perspective view thereof.

The broken lines in the figures depict portions of the portable powerbank that form no part of the claimed design.

CLAIM The ornamental design for a portable power bank, as shown anddescribed.